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| AMC7891 Datasheet, PDF (7/41 Pages) Texas Instruments – Analog Monitor and Control Circuit with 10-Bit, Multi-Channel ADC and Four DACs, Temperature Sensor, and 12 GPIOs | |||
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AMC7891
www.ti.com
SBAS518A â AUGUST 2011 â REVISED DECEMBER 2011
ELECTRICAL CHARACTERISTICS â (ADC SPECIFICATIONS)
AVDD = 4.75 to 5.5 V, GPIOVDD = 1.8 to 5.5 V, SPIVDD = 1.8 to 5.5 V, AGND = DGND = 0 V, External ADC reference = AVDD,
TA = â40°C to 105°C (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN TYP
MAX UNIT
DC ACCURACY
Resolution
10
Bits
INL
Integral nonlinearity
±0.1
±1 LSB
DNL Differential nonlinearity
Specified monotonic
±0.1
±1 LSB
Offset error
±0.5
±2 LSB
Offset error match
±0.4
LSB
Gain error
±0.5
±2 LSB
Gain error match
±0.4
LSB
CONVERSION TIME
ADC conversion rate
500
kSPS
Autocycle update rate
All 8 ADC input channels enabled
16
µs
Throughput rate
SCLK ⥠12 MHz, single analog channel
500 kSPS
Conversion delay
Delay from trigger to conversion start
2
4 µs
ANALOG INPUT
Absolute input voltage range
Full scale input voltage range
Input capacitance(1)
Independent of gain setting
Gain = 1, adcn_gain = '0'
Gain = 2, adcn_gain = '1'
AGND â 0.2
0
0
AVDD + 0.2 V
VREF
V
2 Ã VREF
V
40
pF
DC input leakage current
Measured with ADC in Hold mode
±1 µA
AC PERFORMANCE
SFDR
SNR
SINAD
Spurious Free Dynamic Range
Signal to Noise Ratio
Signal to Noise+Distortion Ratio
THD Total Harmonic Distortion
INTERNAL ADC REFERENCE (2)
fIN = 1 kHz, â1 dBFS sine wave
fIN = 1 kHz, â1 dBFS sine wave
fIN = 1 kHz, â1 dBFS sine wave
fIN = 1 kHz, â1 dBFS sine wave, Measured
up to the fifth harmonic
76
dBc
61
dBc
60.5
dBc
75
dBc
VREF Reference output voltage
Internal ADC reference buffered output at
REF pin
2.5
V
Reference buffer power
Reference temperature coefficient
AVDD = 5 V
360
µA
10
ppm/°C
EXTERNAL ADC REFERENCE
VREF
Reference input voltage
Input resistance(1)
TEMPERATURE SENSOR
External ADC reference input to REF pin
VREF = 5 V, AIN = 5 V
0.3
20
AVDD V
kΩ
Operating range
â40
125 °C
Accuracy
Resolution
TA = â40°C to 125°C, AVDD = 5 V
LSB size
±1
0.125
±2.5 °C
°C
Conversion time
15
ms
(1) Specified by design. Not tested during production.
(2) Use an external buffer amplifier with high impedance input to drive any external load.
Copyright © 2011, Texas Instruments Incorporated
Product Folder Link(s): AMC7891
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